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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. Patrick Walton‏ @pcwalton 16 Jun 2019
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      Realization: Unique ownership is often thought of as a Rust-specific constraint on data, but most languages enforce that constraint for serializable objects.

      5 replies 2 retweets 26 likes
    2. whitequark‏ @whitequark 16 Jun 2019
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      Replying to @pcwalton

      can you elaborate? I can't think of one from this description alone

      2 replies 0 retweets 0 likes
    3. Patrick Walton‏ @pcwalton 16 Jun 2019
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      Replying to @whitequark

      JSON has no syntax for object cycles, so any JSON serializer has to enforce unique ownership.

      1 reply 0 retweets 1 like
    4. whitequark‏ @whitequark 16 Jun 2019
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      Replying to @pcwalton

      I... don't think I've seen a serializer that actually errors out on shared nodes? Not even necessarily JSON, most of them, for any format. Usually the serializer would unshare nodes, and cycle detection would be opt-in or something.

      2 replies 0 retweets 3 likes
      Patrick Walton‏ @pcwalton 16 Jun 2019
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      Replying to @whitequark

      Oh, that's true, usually serializers need only DAGs. Though if you don't supply a tree then your data doesn't technically round trip wrt object identity

      4:54 PM - 16 Jun 2019
      • 2 Likes
      • MBL Bruce priya joseph
      3 replies 0 retweets 2 likes
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        2. Sam Tobin-Hochstadt‏ @samth 16 Jun 2019
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          Replying to @pcwalton @whitequark

          Lisp ftw again!

          1 reply 0 retweets 1 like
        3. whitequark‏ @whitequark 16 Jun 2019
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          Replying to @samth @pcwalton

          so i've recently binged on hbaker's lisp papers and one notable thing i concluded is that you still have to tackle object identity and sharing in lisp. has that changed in the last 30 years?

          1 reply 0 retweets 1 like
        4. 2 more replies
        1. whitequark‏ @whitequark 16 Jun 2019
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          Replying to @pcwalton

          indeed, so IME most of them come with a little warning in the docs that says to not do that

          0 replies 0 retweets 0 likes
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        1. New conversation
        2. Justin Blank‏ @hyperpape 24 Jun 2019
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          Replying to @pcwalton @whitequark

          Java's built in serialization doesn't even require a DAG. Self-reference is acceptable, and preserves the relative identity of the items involved:https://gist.github.com/hyperpape/1b12b486098409aa1de469c85c7fcfca …

          1 reply 0 retweets 0 likes
        3. whitequark‏ @whitequark 24 Jun 2019
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          Replying to @hyperpape @pcwalton

          yeah, same with OCaml

          0 replies 0 retweets 0 likes
        4. End of conversation

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